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Tape member or sheet member, and method of producing tape member or sheet member

a technology of tape or sheet member and production method, which is applied in the direction of inorganic insulators, transportation and packaging, windings, etc., can solve the problems of insufficient heat conductivity of insulating layer in the case of electromagnetic production, and difficult handling of resin, etc., and achieve the effect of easily producing a highly heat conductive tape member or sheet member

Inactive Publication Date: 2008-09-16
KK TOSHIBA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution achieves high heat conductivity in electromagnetic coils and appliances, allowing for efficient cooling and easy manufacturing, while maintaining sufficient electrical insulation and flexibility.

Problems solved by technology

However, according to this method, since the mica layer does not show sufficient heat conduction, the heat conductivity of an insulating layer is insufficient in the case of production of an electromagnetic coil.
However, the resin is difficult to handle because it is solid at a normal temperature.
However, in this method, unless the scaly and highly heat conductive material has a sufficiently high aspect ratio, mica paper cannot be produced and, although scaly alumina is employed as an example of a material having a high aspect ratio, which is the ratio of the diameter and the thickness, alumina has a high dielectric constant and thus is not preferable for an electric insulation material.

Method used

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  • Tape member or sheet member, and method of producing tape member or sheet member
  • Tape member or sheet member, and method of producing tape member or sheet member
  • Tape member or sheet member, and method of producing tape member or sheet member

Examples

Experimental program
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Effect test

example 1

[0060]FIG. 1 shows a cross-sectional view of a mica tape member or a mica sheet member of the present invention. The mica tape member or the mica sheet member comprises a layer containing mica and a lining material, and the mica-containing layer consists of scaly particles 1, particles 2 having a heat conductivity of 0.5 W / mK or higher and a size of 1 μm or smaller (hereinafter, referred to as heat conductive particles), and a binder 3.

[0061]The scaly particles 1 contain at least one of mica and boron nitride.

[0062]The heat conductive particles 2 contain at least one of boron nitride, alumina, silicon nitride, magnesium oxide, carbon, aluminum nitride, silicon oxide (silica), artificial diamond, and titanium oxide.

[0063]Further, the lining material 6 may be a glass cloth or a polymer film such as a polyester, polyethylene terephthalate, and Nomex (trade name).

[0064]Boron nitride (HP-1CAW, manufactured by Mizushima Ferroalloy Co., Ltd.) was employed as the scaly particles 1, an isopr...

example 2

[0072]A tape member or sheet member of Example 2 of the invention was obtained by using a thermoplastic resin or a thermosetting resin as a binder. In Example 1, the water-soluble polymer was used as the binder. In a conventional method of producing a mica tape member or sheet member, since no water-soluble polymer is used, it results in a cost hike. To solve such a problem, the following mica paper was obtained.

[0073]As shown in FIG. 4, mica was used as the scaly particles 1, and the particles were stirred and mixed in distilled water 10 (S1) and the obtained solution was filtered (S2), after which the resulting paper filter was dried at 25° C. for 24 hours (S3) to obtain mica paper 14. On the other hand, a methyl isobutyl ketone slurry 11 of alumina with a size of 40 (nm) (alumina MIBK slurry) was used in place of a water slurry of alumina used in Example 1, and 20 (g) of liquid epoxy resin 12 (CY 225, manufactured by Ciba Specialty Chemicals Inc.) and 16 (g) of an acid anhydride ...

example 3

[0076]The techniques described in Examples 1 and 2 are techniques for holding nano-alumina with a size of 40 (nm) with the polymer type binders, and although the techniques improve the heat conduction, the heat conductivity of a polymer is at highest 0.5 (W / mK) or so and thus it is limited.

[0077]Therefore, a substance precipitated or synthesized by a sol-gel method and containing an organic type resin was used as a binder in Example 3. Specifically, as shown in FIG. 5, a metal alkoxide, e.g., 10 (ml) of tetraethoxysilane 16 (for example, manufactured by High Purity Chemistry), a water-based alumina slurry 18 obtained by mixing 15 (wt %) of alumina with a size of 40 (nm) in 20 (ml) of distilled water 17, and 10 (ml) of ethanol 19 were put in a beaker and stirred and mixed for 20 minutes by a stirrer (S7). After that, a catalyst, for example, 1 (ml) of hydrochloric acid (2N hydrochloric acid) 20 mixed with distilled water 21 was dropwise added to the obtained slurry mixture under stir...

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Abstract

The invention aims to provide a highly heat conductive tape member or sheet member and a method for easily producing a highly heat conductive tape member or sheet member. The mica tape member or mica sheet member of the invention includes a mica-containing layer and a lining material, and the mica-containing layer contains scaly particles, particles having a heat conductivity of 0.5 W / mK or higher and a size of 1 μm or smaller, and a binder.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This is a Continuation Application of PCT Application No. PCT / JP2005 / 000479, filed Jan. 17, 2005, which was published under PCT Article 21(2) in Japanese.[0002]This application is based upon and claims the benefit of priority from prior Japanese Patent Application No. 2004-008270, filed Jan. 15, 2004, the entire contents of which are incorporated herein by reference.BACKGROUND OF THE INVENTION[0003]1. Field of the Invention[0004]The present invention relates to a tape member or a sheet member to be used for electromagnetic coils, electromagnetic appliances, or the like and a method of producing a tape member or a sheet member.[0005]2. Description of the Related Art[0006]Electromagnetic appliances can be made highly efficient, compact, and economical by improving a cooling property of an electromagnetic coil. As a method of improving the cooling property of an electromagnetic coil, it is desired for an electric insulation material that is ...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B32B5/16B32B7/02D21H13/44H01B3/04H02K3/30H02K3/34
CPCH01B3/04H02K3/345H02K3/30Y10T428/257Y10T428/251Y10T428/256Y10T428/25Y10T428/258Y10T428/259
Inventor OKAMOTO, TETSUSHISAWA, FUMIOIWATA, NORIYUKIKAKIUCHI, MIKIOYAMADA, TOSHIMITSU
Owner KK TOSHIBA
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